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1·Physical activity is an important factor in maintaining fitness.

体育活动是保持健康的一个重要因素。《柯林斯英汉双解大词典》

2·Unemployment is the single most important factor in the growing crime rates.

失业是犯罪率日益上升最重要的一个因素。《牛津词典》

3·The closure of the mine was the single most important factor in the town's decline.

矿山的关闭是这个镇衰落的唯一最重要的因素。《牛津词典》

4·The single most important factor that separates ordinary photographs from good photographs is the lighting.

区分一般照片和好照片的惟一重要因素是光线效果。《柯林斯英汉双解大词典》

5·The gas is an important factor that causes climate change all around the world.

这种气体是导致全球气候变化的一个重要因素。

6·Paper in landfills causes the release of methane, a gas that is an important factor in climate change all around the world.

垃圾填埋场的废纸会释放甲烷，甲烷是导致全球气候变化的一个重要因素。

7·Location was an important factor for all four countries.

地理位置对这四个国家来说都是一个重要的因素。

8·Another important factor is the technical efficiency of a country's people.

另一个重要因素是一个国家人民的技术效率。

9·Another important factor to consider is the cost of saving these endangered species.

另一个需要考虑的重要因素是拯救这些濒危物种的成本。

10·The latter was an important factor in attracting settlers to the United States during the 19th century.

后者是19世纪吸引移民到美国的一个重要因素。